UltraFractal
UltraFractal is a software program which enables you to make fractals. Together with FractalExplorer they are the two programs I always use to create fractals.
Combined with Paint Shop Pro they offer endless creative possibilities. Throw in a few plugins and filters and the results can be just awesome.
The other day I was playing with UF and PSP and came up with what I call "a jewel". You may also call this abstract, I don't mind. Hope you'll like it.