For animal related community service
Well, you can knit blankets, scarfs, hats, mittens, ponchos, etc, for the homeless.
As far as animal related community service goes, you can also knit comfortable dog blankets and pillows to turn into the animal shelters. The pattern is pretty easy to improvise - I'm sure you could use a pair of very large circulars, knit the outside of a pillow, stuff it with batting, and then seam it on the sides.
And as far as items for the homeless, there are thousands of patterns online that are simple and quick....just type into google "Basic knitted hat" or "scarf pattern knitting" or "basic patchwork blanket".
Hope this helped! Good luck!