Actually, there is logo artwork you can download from Sun.
After you sign your agreement and send it back, they're supposed to send you a URL for you to download the graphics. It existed for the SCPJ2 level and supposedly exists for the SCWCD level as well (since I got a similar letter and statement from Sun).
I haven't heard back from them yet after I sent in the agreement, so I could be wrong.
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Theodore Jonathan Casser
SCPJ2 and SCWCD
IBM Certified Specialist - WebSphere Application Server, Std. Ed, V3.5