What should I do for my other 3 rune pages?

What should I do for my other 3 rune pages that I haven't filled up? I have 6 in total, and my first 3 are filled with;

1 (AD) AD marks, Armor seals, MR glyphs, AD quints 2 (AP) MPen marks, Armor Seals, MR glyphs, AP quints 3 (ADC) AD marks, Armor seals, MR glyphs, AS quints

Also, I accidentally bought scaling AD quints. Should I ever even use them? lol