hi tom, it all depends what you like.just list a few things down. do you prefer straight or curved lines on a shell? light colours or dark? you can do some really good shells with spray cans,just take your time and enjoy doing it.as for inspiration,you can get it from anywhere,its just taking an image or something you've seen(poster/advert/i used a for sale sign the other week),and twisting it about to fit it onto a shell. for instance take the 'post reply' logo on here.you could go a white front end(slanted square shape)light blue shaded into a darker one with a yellow/ brown stripe up the side and over the roof???
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