Another example, just recently was shown an MSX1 game with beauty background. That can't have been a C64 CPC ZX port. Practicaly 8bit homecomputers should be avoided if you want inspiration for MSX tiles.
.......but by carefully checking 1980s Amstrad CPC 464 and Commodore 64 loading screens, you may find inspiration how to do very colourful loading screens (or title screens for cartridge release). I mean that not every single outline should be one pixel wide. If you can accept a bit of blockiness to certain parts of your picture, you can make much more colourful picture. 
The result can be a bit similar like in Commodore 64´s multicolour mode. When making vertical pixel line, pixels will look blocky, but horizontal lines can be thin. One inspiration could be to play Level 9´s graphical adventures, their graphics look quite like Amstrad/Atari/Commodore 64 "blocky mode" graphics. Some screens from Level 9´s graphical adventures nearly look like they are not meant to exist on MSX-1! Which is not a bad thing at all!
There is an amazing version of Rodland for the spectrum 128, would that be possible to convert to msx?
a cartridge game would be amazing! Pang is on it's way which is excellent news, But Rodland, space harrier and Ghouls n ghosts for msx1 would be just as welcome 
Also Commando ( wolf of the battlefield in japan) is a game that is crying out to be remade! It's a very poor version and i am sure that someone with the talent and time could make it much better. Mr.do and burgertime could also be remade with better graphics and movement
What i like about Rod Land is that:
https://youtu.be/31ZjnrHR8EA?t=44
... and the musics from arcade version!
