Add in the fallback ui colors.

static/ui-colors.less

@@ -1,4 +1,55 @@
 // This file has fallback colors. It specifies the color variables all themes
 // must implement.
 
-@background-color-1: #fff;
+// Colors should be chosen mostly for their utility in packages. We dont want
+// people to have to think about what colors to use. The thinking is that they
+// will be able to follow some guidelines, and generally get something that
+// looks reasonable.
+
+// Least subtle -> most subtle
+@text-color-1: #333;
+@text-color-2: #444;
+@text-color-3: #555;
+
+// For text on dark/colored background's
+@text-alt-color-1: #fff;
+@text-alt-color-2: #fff;
+@text-alt-color-3: #fff;
+
+// Least subtle -> most subtle
+@text-color-subtle-1: #777;
+@text-color-subtle-2: #999;
+@text-color-subtle-3: #ccc;
+
+// Main bg you should use, a darker alt, and a lighter alt
+@background-color-1: #f4f4f4;
+@background-color-2: #eee;
+@background-color-3: #fff;
+
+// Highlight color for background corresponding in index to background-color
+@background-highlight-color-1: rgba(0, 0, 0, .2);
+@background-highlight-color-2: rgba(0, 0, 0, .2);
+@background-highlight-color-3: rgba(0, 0, 0, .2);
+
+// Border color for background corresponding in index to background-color.
+@border-color-1: #eee;
+@border-color-2: #ccc;
+@border-color-3: #f5f5f5;
+
+// Bright color, darker then lighter.
+// Info colors are generally blue
+@accent-color-info-1: #0098ff;
+@accent-color-info-2: #5293d8;
+@accent-color-info-3: #66a6ff;
+
+// Bright color, darker then lighter.
+// Error colors are generally red/orange
+@accent-color-error-1: #ff4800;
+@accent-color-error-2: #f78a46;
+@accent-color-error-3: #ffa275;
+
+// Bright color, darker then lighter.
+// Success colors are generally green
+@accent-color-success-1: #1fe977;
+@accent-color-success-2: #17ca65;
+@accent-color-success-3: #58f79d;