Yes, this has been asked hundreds and hundreds of times at CSC, PLEASE, search before you ask
Image specs are here, look for same doc for 8945
Creating Custom Background Images
http://www.cisco.com/en/US/partner/docs/voice_ip_comm/cuipph/9971_9951_8961/7_1_3/english/admin/guide/9971cus.html#wp1038500
If you need assistance on doing the procedure on CME, that has also been addressed plenty of times before at CSC, do a quick search and you'll find all you need. Just adjust the image size and folder to any instructions you find.
HTH
java
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www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate
