Yes, azul (blue) has different adjective forms in Spanish depending on the gender of the noun it modifies.
- For masculine singular nouns, the form is "azul": El coche azul (the blue car).
- For feminine singular nouns, the form is "azul": La falda azul (the blue skirt).
- For masculine plural nouns, the form is "azules": Los zapatos azules (the blue shoes).
- For feminine plural nouns, the form is "azules": Las camisetas azules (the blue shirts).
Note that these adjective forms also change according to whether the noun is singular or plural.