Hello there. Can i use symbol for a logo or just a text?

yeah.

which colour do you prefer

I am open to all design ideas, but it should be a white or transparent background.   This will be used on a website and book cover.  

feedback please :)

some new designs hope they are better :D hehe i am waiting for you feedback :D Kind Regards !

Some feedback, Please... good or bad, both are welcome...
Thank you