Oh yeah having them on the floor is no bueno. You might have a bit more bass but they'll require the horn more cranked up and reflect off the floor, and have a super low image.
Best idea is to make a simple table. Just have a piece of 3/4" Baltic Birch plywood cut to the size of the bottom of your speaker, and buy 8 pre-manufactured legs and just glue and screw from the top. Also, if you set them on a table I recommend removing the cheap plastic sliders on the bottom of the speakers so they couple better with the table stands.
If you want to experiment to see how you like it maybe just pick up something cheap at Ikea, or use something you might have laying around at your place?
This is an older pic but I'll post something better this week. ;-)
