Ouch! If you are drawing blood with clothespins, then you are playing with some pretty viscious clothes pins!!!
For those into them they can be fun, and easily made at home too - all it takes is some clothes pins, some decent strong string and a drill. Drill holes in one of the wodden sides of the clothes pins, and then run the string through and tie a knot and repeat. The distance between the clothes pins and knots depends on how close you want them to be.
You can also go to Beyond Vanilla and buy some there. There are always vendors around that sell em.