project update

I have been exploring making my own drawing tools within Processing that are similar to certain imaging editing programs but more custom to what I want to do. The following compositions were made very simply using the mouse and is less than a page of code. The idea is similar to an example on the Processing website. The actual drawing tool is a flower with five petals. I would like to add a GUI that would allow me to simply change the size of the ellipses and the range of colors. Any help would be appreciated.

ConceptDraw and Need a drawing program for Mac

ConceptDraw (specifically the MindMap component) is the software I'm using to design my site map. You can download a free 30 day trial here.

Does anyone know of an easy to use drawing program for Mac? It can either be open source or something with a trial.