No, no, no to La Cucaracha! De Colores would be perfect, Animaterra. A beautiful waltz about the colors in springtime. Here's a translation of some of the lyrics:

All the colors, all the colors that bloom in
the meadows are colors of springtime
All the colors, all the colors that dance in the sky
are the colors of rainbows.

All the colors, all the colors of nature
spring forth to make my heart sing.
Then I know why the colors of springtime
are bringing me joy and a heart full of love,

Yes I know why the colors of springtime are bringing me joy

What do you think? If you don't know the tune, I can send you an MP3. Just let me know.

All the best, Áine