This one in Portuguese - my translation left something to be desired, but the pictures are fairly self explanatory. Direct link to pictorial ~ crochet petal edging. Beautiful, but wouldn't want to have to cover a vast area with this stitch.
How to Crochet the Reverse Shell Stitch (With Photos)
New crochet afghan edging patterns i love the crochet edging on this granny square afghan blanket. it makes a nice change from the usual scallop or picot borders.link to free pattern MMHARHM – Crochet and Knit
Stunning and EASY Crochet Border using Reverse Shells (Video Tutorial)
Your choice of crochet edge can make or break your design. Leaving an edge unfinished is not the end of the world, but if you really want your project to soar, choosing an appropriate finishing stitch can really take it over the edge! - Crafting In Line