Kaleidoscope blocks can be cut into any shape and sewn back together. Some blocks may only have certain pieces cut in this fashion and the rest read as solids or are prints. Other blocks are solely made out of the repeats.
They have different names and different techniques. OBW's and 4 patch posies are just two of them.
What they all have in common are the repeats. Some are fussy cut to get the repeats. Others you cut the repeat off the yardage in strips, stack and cut out your pieces.
Another technique is to take a picture, upload it into a kaleidoscope program. You choose a certain shaped "tool" (triangle or another shape) and then choose a certain element of the picture to repeat in a block (for the effect).
These are then printed on either fabric (for quilts) or cardstock (for cards)