The Rampage is a hybrid (red-solid, gold-pearl) that I liked a lot as well. The only hybrid that I can think of right now is the DV8 Marauder. The Marauder will probably be a little stronger and more angular, but you could tweak the surface to smooth it out if needed.
On the Marauder the red is pearl and the yellow is solid, so opposite from the Rampage. When the Rampage was released years ago the term "hybrid" was not commonly used in the industry, so just like it's hybrid predecessor the Monster Bruiser, Brunswick did not use that term in it's marketing materials.
There are a few balls that could give you a similar reaction with the right layout and surface prep. One that comes to mind for me is the Karma pearl (pink-purple) because of it's fairly strong cover (Activator +) that has proven to be a durable, performing coverstock. If you could find a Loaded Revolver that would also be close, although a tad stronger, too. Let me know if I can help with layout suggestions or ideas. Good luck.
