Not possible because slimes only spawn in slime producing chunks. It's not possible to see these with a specified texture pack. But an XRay would help to see all the way to bedrock to see caves in which they may spawn in. I suggest Strongestcraft. Use the search bar.
already got it no luck was hoping their was some texture pack to tell me where they might spawn or not in on minecraft servers oh well hope notch puts some sorta slime spawning mechanic into the next patch
You're in luck. Check out this tool. It's in-game, and is compatible with Zan's minimap (however, it is not necessary.) You push F3 (without minimap) and it will tell you if you are on a slime friendly chunk (16x16). Enjoy!
texture pack for finding slimes