There is a logo file here: C:\Program Files (x86)\SolarWinds Log and Event Manager Reports\CustomReports
That could be changed and might affect the logo on custom reports only. That is all the customisation that can be done to the look and feel without access to full crystal reports. As your full version crystal reports *.rpt files are going to be accessed by the existing LEM reporting engine I fear that even customised reports may inherit the SolarWinds look and feel. Perhaps someone on THWACK with recent experience in this field will chip in.