Personally I thing that this will be a predominately blonde only thing, as the dye will look fairly blunt against darker coloured hair.
My one big tip for DIY di-dy would be to back comb parts of the hair you wish to dye before you dye it. Not massively but a little bit as this will create a slightly different length to your hair and therefore the dye will blend more, creating a more subtle look.
One of my friends (drop my style aka Iga) has recently dyed her tips pink and I have been considering doing it myself for a few weeks now.
I have red hair, my natural colour is blonde though, and I might just dye the tips orange. If i do I will make sure it is up here faster than you can say 'orange?'