Few Ideas I have are:
(1) Creating gift baskets with products which are complimenting each other for special events like anniversary gift, birthday gift, mother's day gift, etc etc
(2) We can also work with 1-2 shops at a time and mix and match the products and list them as a set.
The problem would be shipping. If we agree on creating gift basket then the shop who's listing the set has to have the products on hand so that if it sells then all the items can ship together.
I think it would be good idea to team up with few shops and figure out how to mix and match products and list them. I believe one of the etsy rule is only one shop can list that product to avoid the traffic confusion.
Would like to hear more ideas and suggestions.
Since my products are all bath and beauty, it can pair up with lot of other products.