There is a lots of svg iconspacks for nokia themers and in carbide there is a easy and fast way of changing the colours of them
I use carbide ui 3.4 and the screens is from a s60 theme
Select icons in resources
Then in properties view, click change all
In the layers view you can se the colours, if you can't click on the coloursymbol in the layers menu:
If you have a slow computer it can take a very long time..
Hope it helps