So you’ve got yourself a snazzy .ico file that you’d like to use in your funky new SWT app. Next step is to find an app that lets you convert .ico files to .gif files (or .png or whatever) that will play with SWT.
To save you some time, if you’re a Windows user, let me point you to the freeware IrfanView which will let you batch convert a whole directory of ico files to gif, png, or whatever. It will also let you set the transparency colour and all that other goodness.
If you’re looking for some icons for your commercial apps, let me just point you to IconExperience and tell you that the money is so worth it. I bought the whole set and they come as .ico and .png (with a pdf catalog to browse). They are just awesome.
If you’re just after some funky window .ico file for free, check out that ones at Fooods Icons. The iCandy Junior set looks pretty darn funky.