I plan to sing these too:
1. Akahitoha
2. Black Lotus (Flowering Night)
3. Shisou Rinne, Reirou no Tsui (Bloom Nobly, Cherry Blossoms of Sumizome)
4. Matryoshka
The problem is that I can adopt many different voices (and it doesn't sound similiar, to my surprise) so I don't know which voice to use. Hopefully my voice will be able to touch the hearts of people, even if my mixing skills can go to hell.
Sayon.