I've been trying frosty f/l or paintpots on cream f/l or paintpots!

some nice combos are:

Rubenesque on top of Soft Ochre (brings out the warm peach)
Haunting on top of Electro Sky (gorgeous shade of lilac purple)
Greenstroke on Blacktrack (shimmery green with some oomph)
Rollickin on Royal Wink (deeper shimmery teal)
Nice Vice on Macroviolet (gives more depth to the purple and takes away a bit of the reddishness of NV)