Donna.....you rock on Y-seams. The bow tie looks great!!
Macybaby.....I don't use invisible thread though that is certainly an option. I use thread color that matches the applique and use a micro-zigzag so it is barely seen. I just prefer seeing minimal thread on my applique and is a personal preference. I'll take a closeup of one of the blocks for you.
i counseled today so no blocks completed...tho, after dinner I'll cut a few in preparation of doing some tomorrow.