You will have less texture problems if all your textures are ^2 (some cards only support this), but you can use transparencies or masks to draw smaller images...
So if you want a image of 103 x 51, just make one with 128x64 with mask or alpha channel to remove the unwanted pixels ;)
So if you want a image of 103 x 51, just make one with 128x64 with mask or alpha channel to remove the unwanted pixels ;)