This is a very easy pattern to work up. If you want a little practice knitting in the round on double pointed needles, this is a great way to get it!
The sample hamsterbeans were knit in Cascade Cotton Rich DK, on size 2 needles.
You can use any yarn that you please for this pattern, though I have learned through experience that knitting toys in a tight gauge with bulky yarns can really do a number on your hands, therefore I would recommend a sport/DK or worsted weight yarn, using needles that are 2 - 3 sizes smaller than what your yarn calls for.
The safety eyes that I used for these guys are 6mm black eyes. A similar effect could be achieved by embroidering the eyes with black yarn.