What is a cocktail served in a cocktail glass with a pale green bottom layer, a red/pink top layer, maybe a purple layer in the middle, garnished with mint, orange, cherry, and a purple stringy thing?

Based on your description of a cocktail served in a cocktail glass with a pale green bottom layer, a red/pink top layer, and potentially a purple layer in the middle, the "Green Fantasy" might be a near fit for what you're looking for. Although it's not an exact match for the multiple layers and garnishes, its vibrant green hue could be an excellent starting point for such a colorful and visually striking drink.

The Green Fantasy, with its melon liqueur base, would naturally provide that pale green foundation you're interested in, and its combination of gin, lemonade, and red vermouth could be used creatively to experiment with creating additional layers, using techniques such as gentle pouring over a spoon to achieve the layered effect you're envisioning. While it typically doesn't call for the garnishes you mentioned, incorporating a mint sprig, orange slice, cherry, and some creative flair for the "purple stringy thing" can elevate the drink to meet your unique specifications.

If the layers are crucial, consider the art of layering cocktails where density differences allow variations like grenadine to sink or certain liqueurs to float, potentially integrating a dash of grenadine or purple Curaçao might achieve a visually appealing top or middle layer.

Remember, garnishes like mint, orange, and cherry not only contribute to the aesthetic but also add olfactory and flavor bonuses to your cocktail experience. Enjoy crafting your visually stunning cocktail!