change lists to tiles and change wallpaper help

i have xbmc on mac atv2 ipad iphone
some devices show channels as lists
some devices show channels as tiles

how do i change them all to tiles?
been trying to figure it out for months and always gave up
any ideas?

also been trying to change wallpaper of videos programs ect for months
still cant figure it out

read lots of forum posts and the wiki still totally baffled