Atlantic Blue posted an interesting article on their blog back in February explaining what a stitch guide is and showcasing some of their favorite stitch guides for their own designs.
It's a good explanation of what basic stitch guides are like. If you are a fan of Atlantic Blue's designers, here are all their currently available guides.
She used a Laura Taylor stitch guide to work up this cute Ashley Dillion-Davis design from her parade series. The canvas can be ordered from Victoria Whitson if your favorite shop doesns't have it in stock.