I would prefer a two or three color design that will also look good as a one color design.
Please do not use the cyan, magenta, yellow, black color scheme that is often used in designs related to offset print. The industries we serve primarily work with spot colors and not CMYK.
Please do not limit the design to a specific segment of the industry by including images of printed apparel, paper rolls, needle and thread or other images that could limit the type of shops that could relate to the design.
Some of the possible slogans (for ideas and inspiration do not use in design):
Simplifying proof approvals for print pro’s
Quick & Easy Proof Approvals for Print Pro’s
Professional Proof Approvals in the Cloud
Background: Before committing ink to shirt (or paper or promotional item) printers provide their customer with a proof image. The purpose of this image is to make sure that both the printer and their client are on the same page and that the printer will be producing exactly what the client had in mind. The client must provide this proof approval before the order gets printed.
Get it? Proof Approval... Proofal.com