A friend of mine did try some at home Anodizing, he offered to do some bits for me but never got round to it. He did however do for my team mate Gadget a pump marker in purple. Although the job was quite good, because he had to do each bit on its own the anno was slightly different colours - I think that gadget did sell the marker on here.
For the small bits you have it will be worth a try, but from what my friend said, it was a load of hassle !!!!!