These blue flowers I remember from my childhood as “grandma’s eyeglasses” – in Swedish, “mormors glasögon”. I never had any idea why. Checking the Swedish Wikipedia article now I find the explanation that in the past, extracts from this plant were used to cure various eye diseases. The leaves have also been used to make herbal tea. Another Swedish name for it is Tea-Veronica. The Latin name is Veronica chamaedrys; in English the plant is also called Germander Speedwell.
The yellow ones are Ranunculus acris – English: Buttercup, Swedish: smörblomma ( “butterflower”).
A very common wild flower in Sweden.