colourblock colours

i have just knitted up a new colourblock cushion in a colour combination called, rather pretentiously, violet and plaster. i've put these on my etsy shop here

so this got me thinking - i love doing colourblock cushions and i often struggle with colour combinations. i did a bit of research and found some of my own mock up colour combinations...

this one we can probably call magenta and lime

and this one possibly coral and putty.

not sure what you think of these as ideas. only a few. maybe you have some suggestions for me that i can knit?