The phlebitis in my arms and vein now turned yellow and blue. is this normal?

Likely some bruising: Why was there phlebitis? Iv site? Like black eye the bruising will change color as the blood is absorbed.

Yes: You are probably looking at blood in or outside your veins that has escaped normal circulation...Look at these areas as 'bruiss' where the pigment elements of the blood, when seen through the protein of the overlying skin looks green or blue ...As the issue resolves, yellow makes its appearance before complete fade-out occurs.

Normal: Bruising goes through several stages. First it gets swollen and red , then it changes to a bluish tone, then it changes to a yellowish color as it starts to fade. This is a result of initial bleeding into the tissues and then as the blood starts to dissolve, the colors change. Phlebitis is a clot in a vein and what you describe seems to be more like a bruise than a phlebitis.