No pattern info for any of these I'm afraid, although Little Miss Colourful there is a basic granny and The Blues is a basic granny with the first two rounds worked in 3dc-popcorns.
Update 14/6/08 - The lovely CPer who made the purple/variegated square for me paid my blog a little visit and left a message to say that it's a Camellia Square designed by Karen Whooley. It was a free pattern on her now defunct website Crochet Legacy. I had to go back to a 2001 page on the Wayback Machine to find it! Where would us pattern addicts be without the Wayback Machine?!
Clockwise from top-left: 1) HDC Mitred Square. 2) Nine-Patch Granny (I'm hoping to find the time to write up a pattern soon). 3) #23 from LA 99 Granny Squares to Crochet #3078. 4) Corner Puffs Motif (adapted).