You can get acrylic paints from a craft store, and use a small paint brush
Jackie...I agree with Jessica but I have found that the little sponge brushes work really well on these smaller items but either should be fine. Good luck
Insert the pots over something stable to hold them in place and use spray paint.
The above would work depending on the size of the pots. If they are for a doll house you will need an artists brush.