I'll be sure to give this Ichigo Mashimaro series a try sometime then.
Have you ever seen Minami-ke? The first season is from the same studio, Daume, and it has a somewhat similar dry sense of humour although with many differences, most importantly how each of the three sisters is in a different level of school and therefore there's a much larger supporting cast of characters.
Mitsuboshi Colors features kids around the same age as Matsuri and Ana and I strongly suspect the original mangaka, Katsuwo, might have been an assistant to Ichigo Mashimaro's Barasui as both manga, which run in the same magazine, Dengeki Daioh, had a very similar style, with another major clue being that Ichigo Mashimaro became a lot more infrequent around the same time that Katsuwo started publishing his own manga, starting with Eureka Seven AO followed by Hitori Bocchi and then Mitsuboshi Colors. Meanwhile, Barasui's art style in Ichigo Mashimaro has noticeably shifted towards being much softer than the solid linework it had up to November 2012.
Mitsuboshi Colors has more of a clothesline plot than Ichigo Mashimaro, with the "Colors" being the self-proclaimed protectors of Tokyo's Ueno Park and they have interactions with adults, a rare sight in Ichigo Mashimaro, that are more reminiscent of Yotsuba &! than the one fifth grade teacher in Ichigo Mashimaro who is always punishing that one character whose name I forget for seemingly no reason at all.
Gabrleil Dropout by Ukami, another Dengeki Daioh title that got an anime adaptation, is a little like what Ichigo Mashimaro would be if the characters were angel and demon girls on Earth (which actually kind of happened once in Ichigo Mashimaro proper when Miu bumped her head doing a backflip and dreamed of the afterlife) and has another major parallel to Ichigo Mashimaro in that both series take place in the same city, Hamamatsu, Shizuoka Prefecture, which is the largest city in Japan outside of Tokyo in terms of area but which is only 20th in terms of population.