I have replaced the Tianocore Logo with the XCP-ng Logo. If anyone needs it, I can share the RPM with you. Here is a Screen of it how it looks like. I can't upload the RPM to the before because I get an Error when I try it.
To replace the Logo I have used the Package edk2-20180522git4b8552d-1.3.2.src.rpm from the Citrix Hypervisor 8.0 Source and downloaded your Docker Image to rebuild packages.
I have installed the SRPM and extracted then the edk2-20180522git4b8552d.tar.gz and replaced the Logo.bmp File under MdeModulePkg/Logo. Then I have repakced the Folder edk2-20180522git4b8552d again as tar.gz and created the SPEC FIle and then I have compiled it. The compile RPM I have installed in XCP-ng, restarted the Toolstack and then I had this Logo there. I find it nicer then the Tianocore Logo.