This is the 5129th most frequent Arabic word.
بألوان
"بألوان" means "with colors" in English.
In this sentence, "بألوان" is used to indicate the means or materials used (colors) in completing the action (painting).
رسم الطفل لوحة جميلة بألوان زاهية.
The child painted a beautiful painting with bright colors.
Here, "بألوان" describes the characteristics of the nouns (flowers) in the mentioned context (adornment).
كانت الحديقة مزينة بألوان مختلفة من الزهور.
The garden was adorned with various colors of flowers.
"بألوان" in this context indicates the descriptive quality of the subject (the rainbow) visible as certain attributes (colors).