I don't think introducing a third pattern is a good idea for the bed. How about some custom covers that match the curtains for two of the pillows?

You need a pattern to pull the different shades of blue together.

I'd go for white bedding and some patterned accent pillows (and perhaps a throw) to pull in both blue colours.

Something like this, but in your colours

White bedding. lower pictures over the bed, they are too high. R

That dentil moulding is also really pretty. Finding a pattern that has the two blues together and echoed the curtains would also work. Basically, so long as you don't introduce a completely brand new pattern, it won't look too busy and can look tranquil and relaxing instead.

What about blue leopard, pink leopard or traditional leopard? I found these fabrics?