A while back, Eph founds a really nice model that clearly had some though put into the design so that you get the look of a multi-colored print through clever use of shadows generated by the geometry. Here's the link: https://www.myminifactory.com/object/chromatic-vase-40704 I previously printed a small one in Everyday PLA (yep - still have some of that stuff - just wish they still sold it) in glow in the dark. It came out really well, and thus went onto the windowsill, but a short while back my wife asked for a large one in purple. I did have some Colorfab nGen in purple, which was accepted and so I printed. Here's the finished result: Ultimately, for such prints you really want to ensure watertightness. For watertightness, I went for belt and bracers. The base is composed of 8 layers at 0.2mm. The bottom 2 are printed with concentric infill to give a pleasant exterior. The next three layers are printed with rectilinear infill at 110% extrusion to try to ensure a good solid fill and also to block any holes generated from the concentric layers. Finally three more layers of concentric infill to give the base a pretty look when staring into it, and also to add more material to guard against leaks. The next weak point for watertightness is the first layer of vase mode at the point where your first layer completes. I printed with 1mm thick extrusion on a 0.4mm nozzle and also 0.2 layers and between all those settings, I think this gives a good shot a watertightness. I put water in and left overnight with a paper towel underneath to check. It was bone dry in the morning . With that done, my wife selected some flowers to complement it and there we have it.