Hello princess
I am very glad that you like the design, and I have to agree with you that is very easy to remember and very noticeable. Thats because the letters are symmetrically balanced and no matter how you see it it will always be JL. Regarding the entry #20, if you print it on a small black boxes in my opinion it will not look good.
So I did couple of changes on entry #19 that you might like.
In #47 and #48 i am using a box shape around the symbol, but the difference between this entries is how the letters in the symbol ends.
In #49 i am using a sphere shape around the symbol, and in #50 and
#51 i have added a glossy effect to the shape, and this adds a more elegant and luxury touch.
Hope you like the changes and if you have any suggestions please feel free to let me know
Kind Regards
Indigo