The best alternatives to >_TerminalSplash are Hyper, Klaus Sinani, and You-Get. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hyper is an open-source and extensible terminal emulator available on MacOS, Windows, and Linux. It's built using web technologies, specifically Electron (the same platform that powers Atom, Slack, and Brave).
Themer takes a set of colors and generates text editor themes, terminal themes, and desktop/device wallpapers. (As well as themes for other apps like Slack and Alfred.)
Lip Gloss a Go library for designing terminal user interfaces. It takes an expressive, declarative approach to terminal rendering. Users familiar with CSS will feel right at home with Lip Gloss.