I am anxiously waiting for the buds to open on my Hoya rotundiflora formerly known as Hoya sp. Square Leaf.  It has only flowered once for me and did not flower at all last year.  I am looking forward to being able to properly photograph the flowers and the plant for this site.  It is a very easy care plant, and did really well for me over the winter by actively growing in the regular house with no added humidity.  After reading more about its probable growth habits in the wild, I believe it did not flower for me last year, because it was kept too warm in my artificially lit grow-room.  Here is a photo of the developing buds: