I've been inactive in this forum for 2 years, i guess.
I would like to know again ( i forgot) how does the Toribash's trading system works now.

I mean, if i want to trade a texture of mine for X Tc, how can i make it safely? Even with normal items (like forces, relaxes, DQ), how would i be able to do it without having the fear to be scammed?

First, if you were to put it up on the market for anyone to buy there's no chance you can be scammed.
If you're looking for direct trade with a specific user however, http://forum.toribash.com/safetrade_list.php is available. The mechanics are explained here too. Basically the whole trade cannot proceed until both users have entered the items/tc they want to trade, and then the owner of the safetrade agrees to it.

You can't really go wrong with either of these, don't bother using the transfer items/tc services unless you're giving someone something or it's someone you trust very much (even then).
If you do decide not to safetrade you should take screenshots of the trade agreement, as evidence if you get scammed.
Without evidence you might not be refunded at all.

for items is the possiblity of the "safetrade" feature.
http://forum.toribash.com/safetrade_list.php
but from what i heard like no one uses this.
otherwise just let the other people sent their stuff first, also there is a scam reports board which usually deals quite fast with that sort of stuff, so u dont rlly have to worry.

for texture's doesnt exist such a feature, just let the other's people sent first, as i said above.