A wallpaper war varies between webcomics but mainly consist of a choice between two or more wallpapers (although other things such as back stories have been "bid") Sometimes the bidding war will be kept up to date with drawings showing the reactions of the characters involved. DMFA has had multiple wallpaper wars with both a variety of characters and things to get. Abel's backstory was the result of a bidding war in which the character showed horror in winning. since it's just one massive break in the fourth-wall the characters will talk directly to the audience as well as each other.