Default any themer willing to help me?

I have a custom theme made for me by rockratt which i love. Wont upgrade cause it wont be compatible with the latest android version on my s4. As you can see its a bike theme and ive since sold my bike and got another so id like to change some pics in the theme but dont know how. Another guy helped but couldnt get these so im appreciative of his help for what hes done but would like to change the rest to be complete...lol. if anyone can help ill send the theme and pics i want them changed to . The pics are my scrubbers, the dialer and setting background as well as making my multi window tab a bit larger.
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