Just added a script pack for building a texture changing HUD. They are intended for use in products you sell, such as hair, eyes or shoes, but would also be a useful tool for builders who which to change textures quickly, particularly for making quick adjustments to changing small specific parts of an object (only some sides, or some prims).
It supports almost unlimited textures (textures stored in prim inventory limited only by what the server will support, textures stored in-script limited by memory), and provides a preview of each texture. Although a sample HUD is provided, it is anticipated that must customers will want to build their own HUD, and full instructions are provided (HUD assembly is straight forward, with most of the configuration done by naming prims).
XStreetSL: https://www.xstreetsl.com/modules.php?name=Marketplace&file=item&ItemID=1656704
inSL(tm): http://slurl.com/secondlife/Sunweaver%20Air/197/18/25