The file you want to display must be in the /Palm/Programs/ZLauncher/BackImage.
The in Tab Properties, select the General tab (should be the first one selected) and then tape in the space next to BackImage then play with whatever floats the boat.
As for contact software, I have tried a few and frankly have stuck with the default contact manager. However! TakePhone 7 has the ability to search the contacts and it allows you to configure that search in a number of ways. I have it set to search last, first and company name. Site:
www.shsh.com and the latest beta is at
www.shsh.com/beta - that is where Takephone 7 is at.
2Day, also from SHSH Software can be set to search via Takephone and it beats the heck out of doing it via the contacts manager.
Ben