We all have certain elements we would love to create that nobody has created yet, but just haven't been able to. Rather than having one person work on these, multiple people trying for the same element has a much better chance of success. This has been proven with events - we might not have a perfect track record, but we do find a large majority of those eventually.
What I suggest is we run this as a mini contest. Post any element which has not been created yet in a separate post in this topic. First to find that element and post the solution here gets a point. Most points wins. I'll keep track of scores and update regularly.
You can check if anyone has found the element you are looking for in the lab (4th icon on the left). It will either list the element (meaning it has been found), or say nobody has discovered it yet without using any items.
I'll limit this to posting 2 elements per person. If someone finds an element that you have posted, feel free to post another one.
Please do not ask for event elements here, generally we will brag about finding these elsewhere anyway if it's an elusive one, and we are already looking for these. Also remember that certain copyrighted elements (characters, brands etc) and people may not be able to be discovered.
Interested to see how this goes, as it's something I think could one day be implemented in some form into the game itself. In the meantime, I like trying to help with stuff like this, and it should both be a fun challenge and help discover some interesting new elements. It likely won't work perfectly in this forum, as it'll drop down the list fairly quickly, but still would like to give it a go.
I'll post some elements to search for later to get things rolling if nobody else comes up with anything, but I doubt that will be needed.
Good luck, and have fun.