At arts stores you can get all sorts of pretty papers in pretty prints and designs. It might be nice to make each invite look different.
I've pasted these pretty prints on to different shades of card stock, added ribbon, and hand-written invite info.
I'm also doing a dholki for my cousin. We're cutting out paper in the shape of a dhol and putting the info on there.
Oh I love the Dhol idea... can you post picture of the invitation? if you dont mind :)