Hi there. Here are some colour variations:
#94 & #95 - orange and blue.
#96 & #97 - same colour as #11. I would call this more pink than purple, perhaps cerise.
#98 - I don't think it's ever going to work having the rings in orange and another colour.
#99 & #100 - orange and purple.
#101 & #100 - light pinky/red.
#103, #104 & #105 - green/blue. I'm not so sure about the grey curving lines - do you think it looks better in #105 with curves in the second colour and behind the concentric rings?
Generally, I think the rings are tending to stand out more if they are orange and the oval shape is in the second colour, and the curving lines are better behind the rings. What do you think?