After much work, I've managed to electroplate something!
It looks sufficently awful that I'm not posting pictures, but I've managed to successfully plate an old steel screwdriver with a heavy coat of nickel. I used a rather crude mixture of roach killer (60% boric acid, 40%...something else?) and nickel sulfate which I will hopefully refine in the future. The plating anode was a piece of stainless steel from the hardware store.
(NOTE: Nickel sulfate is cheap stuff - about $8 a pound if you buy from the right place. However, many places won't sell to residential addresses.)
Next up is finding some higher-quality boric acid (can anyone recommend a source that will sell to residential addresses?) and finish my current-regulated power supply.