You can use colours for various purposes, yes.
http://www.angelfire.com/empire/serpentis666/Color.html
http://www.angelfire.com/empire/serpent ... ation.html
The colours correspond to the same-coloured Chakras, which also correspond to the planet which rules each respective Chakra...which also corresponds to a particular Day (and also Hours of days) for a purpose. e.g. Green can be used for love (not lust), which is Friday, which is Venus, which is your Heart Chakra. If you wish to connect with someone for love reasons, you can use these (and any Runes and perhaps SATANAS, and also sexual orgasm energy especially) and connect your Heart Chakra with theirs. This could be unhealthy or dangerous, though, if they are Without and therefore have dirty Chakras and a dirty Soul and Aura. Also if not connecting your Heart Chakra with theirs, making love with them could also be unhealthy or detrimental. You are free to decide which course of action to take, though - it is your life.
You can also programme your and/or your lover-to-be's Aura with Green. If you want a bit of lust, you can add shimmering Red; contrarily, if you want a lot of lust and a bit of love, use Red with a bit of shimmering Green. For love, you could wait for the Moon to be in Cancer or Leo, but the best time would be when the Moon is in Libra. The Moon in the Signs is also relevant and imporant. You don't have to wait for this, nor the Day and Hour or Hours, but not doing so would lose a lot of benefit, which would make it harder and take longer. For the most optimal time and results, e.g. Moon in Libra, on Friday (Day of Venus), During Hour of Venus, and not Moon Void of Course, could take months and months or years of waiting - would you want to wait for that long before getting absolute optimal timing and results?! You'd have achieved results already if you didn't wait for that long!
Other colours; Runes; Planets; and Days (and Hours of days) can be used for other things. You should also do a decent affirmation, as well.
Remember to not start workings during the Moon's Void of Course.
http://www.angelfire.com/empire/serpentis666/VOID.html
Venus
http://www.angelfire.com/empire/serpent ... Venus.html
Runes
http://www.angelfire.com/empire/serpentis666/Odin.html