While looking at solid (strong) shapes for vases in blender 3d (while playing with bezier curves), for my wife, I saw a shape that looked solid, and nicely shaped. It doesn't take to much away from the flowers, yet it still very beautiful.. It is also functional, and even though it has a smaller hole, it is large inside to hold a lot of water.
If you look at the photos, You'll notice its Peeps approved..
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I used 2 walls, 3 for top and bottom layer counts. In slic3r I used support were needed at 5%. In Cura I used 10% with Gradual infill steps at 2. Both no support.