Originally, I wanted to find an instructable or a ready template, but I couldn't find any good ones, so I decided to make my own.
What did I make? A wooden lyre that can actually play in tune. It has no sound box, so it's quiet.
How did I make it? I created my own pattern using large circular objects as guides and then used my own method to make it symmetrical. I used my dad's jigsaw to cut the smooth curves and then sanded it to shape.
Where did I make this? I made it at home, mostly on the kitchen floor and in the garage, but I made it for school.
What did I learn? I learned that veneers are annoying when you need to sand because they tend to get ripped off. I learned that fishing wire is much stretchier than the average violin string and is therefore harder to tune and needs more frequent tuning. I learned that making a design is actually quite easy if you weren't expecting a musical instrument but instead a representation. It was a happy accident that it can actually be tuned and played. I learned to play "Twinkle Twinkle Little Star" on a lyre.
I designed it myself, cut it myself (mostly), tuned it myself, learned to play a song on it, and got an A+ for my hard work.