I wish Riot would make new PROJECT: skins

When the PROJECT: Yasuo skin came out i thought Riot out did themselves. In my opinion, it is one of the cooler in game skins in LoL. I've read some board posts and fan are of potential champs for a PROJECT skin and have loved all of them so far. But why hasn't there been a new one made? Or is it a one-time, one-champ only skin concept? If anyone know the answers to either of these I'd love to hear them. And as for champs that i think would look amazing with a PROJECT skin lists as follows:

• Varus/Ashe (holographic/orange arrows with a sleek silver bow or matte black bow)
• Quinn (holographic/orange valor and maybe a GLADIOS voice over for quinn?)
• Riven (more obvious, same concept as Yasuo but put onto Riven)
• Kassidan (holographic/orange sword, pulse would look similar to Rivens ult, everything thats purple now replaced with orange/neon look)

Those are the ones I'd like to see most but if anyone has other good ideas please comment below! I always love to see new ideas! Stay classy summoners :^)