diff --git a/src/aimless.ts b/src/aimless.ts
index bc2afcb..439df05 100644
--- a/src/aimless.ts
+++ b/src/aimless.ts
@@ -15,3 +15,4 @@ export { default as uniqFuncIntRange } from './uniq-func-int-range'
 export { default as uniqFuncSequence } from './uniq-func-sequence'
 export { uuid, uuidWithEngine } from './uuid'
 export { weighted, weightWithEngine } from './weighted'
+export { rgba } from './rgba'
diff --git a/src/rgba.ts b/src/rgba.ts
new file mode 100644
index 0000000..3f5a0b8
--- /dev/null
+++ b/src/rgba.ts
@@ -0,0 +1,13 @@
+import { intRange } from './int-range'
+
+const rgba = (alpha?: number) => {
+  const r = intRange(0, 255)
+  const g = intRange(0, 255)
+  const b = intRange(0, 255)
+  if (alpha === undefined || alpha === null) return `rgb(${r}, ${g}, ${b})`
+  return `rgba(${r}, ${g}, ${b}, ${alpha})`
+}
+
+export {
+  rgba
+}
diff --git a/test/index.js b/test/index.js
index 694afdf..07b0709 100644
--- a/test/index.js
+++ b/test/index.js
@@ -28,7 +28,8 @@ const {
   uniqFuncSequence,
   uniqFuncIntRange,
   weighted,
-  weightWithEngine
+  weightWithEngine,
+  rgba
 } = require('../dist/aimless')
 
 /* eslint-env mocha */
@@ -175,6 +176,11 @@ describe('aimless', () => {
     expect([true, false]).to.include(bool())
   })
 
+  it('should produce a random rgb(a) color string', () => {
+    expect(rgba().replace(/\s+/g, '')).to.match(/^rgb\((\d{1,3}),(\d{1,3}),(\d{1,3})\)$/)
+    expect(rgba(0.5).replace(/\s+/g, '')).to.match(/^rgba\((\d{1,3}),(\d{1,3}),(\d{1,3}),([01](\.\d+)?)\)$/)
+  })
+
   it('should produce a sign (-1 or 1)', () => {
     for (let i = 0; i < 100; i++) {
       expect([-1, 1]).to.include(sign())