diff --git a/__tests__/mergeConfigWithDefaults.test.js b/__tests__/resolveConfig.test.js
similarity index 93%
rename from __tests__/mergeConfigWithDefaults.test.js
rename to __tests__/resolveConfig.test.js
index 0d0f68611..7ef2cbbe3 100644
--- a/__tests__/mergeConfigWithDefaults.test.js
+++ b/__tests__/resolveConfig.test.js
@@ -1,4 +1,4 @@
-import mergeConfigWithDefaults from '../src/util/mergeConfigWithDefaults'
+import resolveConfig from '../src/util/resolveConfig'
 
 test('prefix key overrides default prefix', () => {
   const userConfig = {
@@ -21,7 +21,7 @@ test('prefix key overrides default prefix', () => {
     },
   }
 
-  const result = mergeConfigWithDefaults(userConfig, defaultConfig)
+  const result = resolveConfig([userConfig, defaultConfig])
 
   expect(result).toEqual({
     prefix: 'tw-',
@@ -61,7 +61,7 @@ test('important key overrides default important', () => {
     },
   }
 
-  const result = mergeConfigWithDefaults(userConfig, defaultConfig)
+  const result = resolveConfig([userConfig, defaultConfig])
 
   expect(result).toEqual({
     prefix: '',
@@ -101,7 +101,7 @@ test('separator key overrides default separator', () => {
     },
   }
 
-  const result = mergeConfigWithDefaults(userConfig, defaultConfig)
+  const result = resolveConfig([userConfig, defaultConfig])
 
   expect(result).toEqual({
     prefix: '',
@@ -158,7 +158,7 @@ test('theme key is merged instead of replaced', () => {
     },
   }
 
-  const result = mergeConfigWithDefaults(userConfig, defaultConfig)
+  const result = resolveConfig([userConfig, defaultConfig])
 
   expect(result).toEqual({
     prefix: '-',
@@ -227,7 +227,7 @@ test('variants key is merged instead of replaced', () => {
     },
   }
 
-  const result = mergeConfigWithDefaults(userConfig, defaultConfig)
+  const result = resolveConfig([userConfig, defaultConfig])
 
   expect(result).toEqual({
     prefix: '-',
@@ -281,7 +281,7 @@ test('missing top level keys are pulled from the default config', () => {
     },
   }
 
-  const result = mergeConfigWithDefaults(userConfig, defaultConfig)
+  const result = resolveConfig([userConfig, defaultConfig])
 
   expect(result).toEqual({
     prefix: '-',
@@ -331,7 +331,7 @@ test('functions in the default theme section are lazily evaluated', () => {
     },
   }
 
-  const result = mergeConfigWithDefaults(userConfig, defaultConfig)
+  const result = resolveConfig([userConfig, defaultConfig])
 
   expect(result).toEqual({
     prefix: '-',
@@ -399,7 +399,7 @@ test('functions in the user theme section are lazily evaluated', () => {
     },
   }
 
-  const result = mergeConfigWithDefaults(userConfig, defaultConfig)
+  const result = resolveConfig([userConfig, defaultConfig])
 
   expect(result).toEqual({
     prefix: '-',
diff --git a/defaultTheme.js b/defaultTheme.js
index 791879b98..544ecc9b4 100644
--- a/defaultTheme.js
+++ b/defaultTheme.js
@@ -155,8 +155,8 @@ module.exports = function() {
       normal: '0',
       wide: '0.05em',
     },
-    textColors: colors,
-    backgroundColors: colors,
+    textColors: theme => theme.colors,
+    backgroundColors: theme => theme.colors,
     backgroundSize: {
       auto: 'auto',
       cover: 'cover',
@@ -169,7 +169,9 @@ module.exports = function() {
       '4': '4px',
       '8': '8px',
     },
-    borderColors: global.Object.assign({ default: colors['grey-light'] }, colors),
+    borderColors: theme => {
+      return global.Object.assign({ default: colors['grey-light'] }, theme.colors)
+    },
     borderRadius: {
       none: '0',
       sm: '.125rem',
diff --git a/src/index.js b/src/index.js
index 1cdf25256..1985aee55 100644
--- a/src/index.js
+++ b/src/index.js
@@ -6,7 +6,7 @@ import perfectionist from 'perfectionist'
 
 import registerConfigAsDependency from './lib/registerConfigAsDependency'
 import processTailwindFeatures from './processTailwindFeatures'
-import mergeConfigWithDefaults from './util/mergeConfigWithDefaults'
+import resolveConfig from './util/resolveConfig'
 
 const plugin = postcss.plugin('tailwind', config => {
   const plugins = []
@@ -17,17 +17,17 @@ const plugin = postcss.plugin('tailwind', config => {
 
   const getConfig = () => {
     if (_.isUndefined(config)) {
-      return require('../defaultConfig')()
+      return resolveConfig([require('../defaultConfig')()])
     }
 
     if (!_.isObject(config)) {
       delete require.cache[require.resolve(path.resolve(config))]
     }
 
-    return mergeConfigWithDefaults(
+    return resolveConfig([
       _.isObject(config) ? config : require(path.resolve(config)),
-      require('../defaultConfig')()
-    )
+      require('../defaultConfig')(),
+    ])
   }
 
   return postcss([
diff --git a/src/util/mergeConfigWithDefaults.js b/src/util/resolveConfig.js
similarity index 51%
rename from src/util/mergeConfigWithDefaults.js
rename to src/util/resolveConfig.js
index 57c1fceb0..2f1677307 100644
--- a/src/util/mergeConfigWithDefaults.js
+++ b/src/util/resolveConfig.js
@@ -4,18 +4,17 @@ function resolveFunctionKeys(object) {
   return Object.keys(object).reduce((resolved, key) => {
     return {
       ...resolved,
-      [key]: _.isFunction(object[key]) ? object[key](object) : object[key]
+      [key]: _.isFunction(object[key]) ? object[key](object) : object[key],
     }
   }, {})
 }
 
-export default function(userConfig, defaultConfig) {
+export default function(configs) {
   return _.defaults(
     {
-      theme: resolveFunctionKeys(_.defaults(userConfig.theme, defaultConfig.theme)),
-      variants: _.defaults(userConfig.variants, defaultConfig.variants),
+      theme: resolveFunctionKeys(_.defaults(..._.map(configs, 'theme'))),
+      variants: _.defaults(..._.map(configs, 'variants')),
     },
-    userConfig,
-    defaultConfig
+    ...configs
   )
 }