Quite an odd bunch of figures you have there! With such a limited supply, I'd suggest a small display. You could take the easy route and buy various scaled dioramas, but I have limited knowledge on that front. I much prefer to build my on displays by hand. I'm not sure if you're crafty with image editing software, but that is my method of choice. For a display of such a small amount of figures that don't go together as a whole, I suggest pairing them off and putting them in cool poses. I made a quick mock up of an idea.
A display of thick glossed cardstock paper, printed with designs to match the figures, then folded and glued.
At least that's what I would do.
But if you prefer something a little simpler, you could try "Luke's Toy Store". He doesn't seem to have any of the striking dioramas in stock anymore, but the acrylic stands work well too.
Regards,
-CBMM1