Beppu in Oita styles itself "flower town" and is reflected in its choice of designs for manhole covers. A previous post can be found here. This post shows a few more. This first one is of tsutsuji, azaleas.
This may very well be another azalea design or possibly hibiscus.
This ones easy.... cherry blossoms and tulips.... but I couldn't find it in color.
Not sure what this one is....