Here's a couple of ideas i found out of a magazine:-
(1) Tiger nails, the one in the mag used pink and black (though i suppose you could use the real tiger colours- eg orange + black) paint the whole of the nail using the pink and then using a black nail pen paint stripes on.
(2) Rule Britannia! this is a tricky one which requires patience, but they look sooo cool when they're done.
You need blue nail polish, and a red and a white nail pen.
Paint your nails blue- leave to dry for ten minutes. Paint a white cross on your nails (leave to dry again) then paint a diagonal line with the white pen (so you get the whole of the white part of the union jack) again leave to dry. Then to finsih off paint tiny red lines on top of the white ones to get the complete look- get a piccy off google- so you know exactly what the flag looks like to help.
(3) Finally- the tartan nails.
You need a toffee/caramel colour nail polish, and a red and black nail pen.
Paint your nail using the caramel colour. Then use the pens to get the tartan look (again go on the internet for inspiration)
Happy nail painting!
Please post any other designs you have, or pm me - if you do any of these please post piccies!