You can get four random skins per week, free of charge just by playing the game. It takes about 12 - 16 hours to get all 4, and it resets each week on Thursday sometime between noon and 2 PM Pacific (so between 8 and 10 PM Greenwich). Mods, console commands etc. have no influence, so there's no need to worry about them.
If you don't like the skins you get, you have three options:
Trade them with other players for other skins or other Steam inventory items. (trading cards, refined metal, TF2 & CS:GO keys, etc.) This is what we've been doing since October.
Buy from & sell to other players for real $ on the Steam market. This has only been around less than 24 hours.
Convert 9 skins for 1 of the next higher rarity (with a small chance of getting something even rarer) at the Trade Inn. This was also introduced yesterday.
Or I suppose you could just ignore them.