Just as everyone says, beading on your work is really about personal preference. Many folks used beads in place of French knots. I do either depending on the pattern and my mood. Beads and tubes work well in florals and art deco. They come in such a variety of colors now that beads can be as sparkly or as subtle as you like. Get a spare piece of aida and play with the effects to see what you like.
As it happens I just finished 2 projects where I incorporated beads that were not called for in the original pattern. My daughter did the college internship program at Disney and came back with a piece of mat board with many of the character signatures. I had these old patterns and did both to see which would look best inside the mat. (We decided on the castle, in case you were wondering. And yes, back in the late 80s and early 90s, that is exactly what Cinderella's castle looked like.

) The castle called for French knots using either the gold or silver metallic threads. I decided to go with corresponding gold or silver beads as doing a French knot with metallic thread is always going to be a hit or miss proposition due the tendency of the metallics to fray. For the Sorcerer's Mickey, the original pattern was for simple cross stitches in both gold and silver. I didn't particularly care for the way that looked, but using gold and silver beads in place of each stitch was too much. I opted to do the gold cross stitches and the straight stitching with the gold thread as indicated on the pattern. But, for the silver cross stitches, I used a clear crystal bead on the silver metallic thread to give sparkle and depth.
Sorry they're still a little messy. I (obviously) haven't washed or blocked them yet.
