Light jigs usually call for light pork rinds. The same goes for a dark jig, which usually gets a dark pork rind. Sometimes a local behavior trend will upset the cart and anglers will swear a strange light/dark combination is best right now, but stick to the old combination as a rule. If you have a dark blue jig, a black pork trailer might be appropriate.
Use a smaller trailer instead of a bigger one if you hope to get more bites. It seems bigger fish do like large trailers, but experiment for best results.
It's not wrong to skip adding a pork trailer altogether and to fish the bass jig just plain. Plain jigs will catch bass sometimes. But it's a little like baking a cake and not bothering to add icing-you're better off with something on it.
Plastic crawfish have become an increasingly popular trailer for jigs. The plastic claws stand up when the jig is resting on the bottom, since the crawfish is hooked onto the jig by the tail, and it adds a great appeal for jigs. Pick a small size for these trailers also, and follow the same color combination guide lines for pork frogs.