Thanks to rotten for this info

How to create your own patterns

This is a list of technical specifications to make patterns that can be submitted to ColourLovers and so used as pattern templates on this site.

This thread does not cover how to make a repeating pattern or how to use vector software.

You can use any kind of svg (scalable vector graphics) processing software, for example Adobe illustrator, the discontinued macromedia freehand or an open source alternative, inkscape (http://www.inkscape.org).

rotten suggests these sizes: Start with a 400×400px document, with 300dpi resolution and pixels as ruler units to use transforming tools more effective.

For specifying different colour areas, be sure to work with layers and to seperate each color on its own layer

Every layer should be expanded for strokes and fills becoming objects rather than object properties, which would help its cross-platform usage.

If any typographical elements are used in your pattern, these have to be created as outlines ("create outlines" in adobe illustrator).

Colourlovers palettes need to be sent in vector format, so exported file formats should be .eps, .ai or .svg - where you won't need to export your file embeding icc profiles (as the pattern will be added to the system as greyscale) and .pdf support.

Where do I submit my pattern?

you can use this link to submit a pattern http://www.colourlovers.com/contact