you can simply take a piece of fabric and use a permenent marker and write your own- use a Micron Pigma pen- they are acid free- archival quality- do not bleed, fade- smear- are permenent.
or you can embroider them- or you can usually find pre-printed ones- sold by the panal or yard at many quilt shops (thimbleberries has some nice ones)
you can print them onto fabric- you do not have to purchase special fabric sheets for them (they tend to be expensive) ]
pre=wash your fabric- with detergent- no fabric softener- dry press freezer paper to the back (shiny side to fabric-comes in a big blue box-grocery isle- leaves no residue- is re-usable) cut fabric/freezer paper to the size of printer paper- (make sure all edges are secure- you do not want them to curl in your printer- run it through-
after printing set aside to *cure* let the inks saturate the fibers- then heat set.
some people even write on the backs of their quilts- figuring that way there is no chance of someone removing the label.