Need Icons for Home Page

Hi Folks, I don't think I would be very good at making icons, so I'm looking for 4 big icons for the 2x2 grid. Specifically: 1. Get Involved Something that suggests community/people. 2. Support/Need Help? A question mark, stack of books, chat bubbles, etc. 3. Pecl/Pear Puzzle pieces, gears, lego blocks... 4. Website Tips/Tricks Not sure what visual to use here. There are lots of nice free icon sets out there. If you have a few minutes to spare, I would appreciate help finding some that would fit with our new theme. Ideally the icons will be high resolution (128x128) with a liberal license. Actually, I have no idea what licensing terms would be considered acceptable to the PHP Group. Perhaps Hannes or Philip could chime in here? If they aren't too expensive, I imagine we could buy a commercial license. Thanks, Stew