What OS are you running? Don't you have threaded SMS already? If so, change the settings. My threaded SMS is blue and white. That's pretty much the only options. You can try crunch SMS that i posted above to see if that app is more like that you want.
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With crunchsms? i don't know. Never tried it. i thought i read that it has color options. Someone will come along that uses it. Or search for 'crunchsms' in thread titles.
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With everyones help I'm loving my blackberry more every day !!!! as I'm getting great advice from the Crackberry Team, I'm filling this phone with Apps that make it perfect for me. THANKS EVERYONE x