You said you wanted to mess with runes, so here's a list of some runes. This isn't every single one, but rather the Anglo-Saxon set, with the sound in parenthesis.
ᚠ Feoh (F)
ᚢ Ur (U)
ᚦ Thorn (TH)
ᚩ Os (O)
ᚱ Rad (R)
ᚳ Cen (C)
ᚷ Giefu (G)
ᚹ Wynn (W)
ᚻ Haegel (H)
ᚾ Nyd (N)
ᛁ Is (I)
ᛄ Ger (J)
ᛇ Eeoh (EO)
ᛈ Peord (P)
ᛉ Eolh (X)
ᛋ Sigil (S)
ᛏ Tyr (T)
ᛒ Beorc (B)
ᛖ Eoh (E)
ᛗ Mann (M)
ᛚ Lagu (L)
ᛝ Ing (NG)
ᛞ Darg (D)
ᛟ Ethel (OE)
ᚪ Ac (A)
ᚫ Aesc (AE)
ᚣ Yr (Y)
ᛡ Ior (IA/IO)
ᛠ Ear (EA)
ᛣ Kalk (K)
If you're getting rectangles or question marks, it means you don't have a rune-compatible font installed. Segoe UI Symbol (sans, default on Win 8), Code2000 (serif), and Unifont (mono, might be default on Linux) all support runes.