ピクニックシートの上で手を振る5人の友だちの上に、見出し「Welcome to the Club」を配したフラットなカートゥーン調のウェルカムポスターです。タイトルはクリーム色の背景に、太くて丸みのあるダークティールの文字で、パステルの塊やきらめきの前に、ピンクのギンガムチェックのシート、バスケット、いちご、クッキーが描かれています。見出しを自分のクラブ名やあいさつに差し替え、色やグループもイベントに合わせて変更できます。

Create a finished square flat-cartoon illustration for a cheerful club welcome. At the top, set the exact title “Welcome to the Club” in large, friendly, heavy rounded sans-serif lettering, dark teal, with open counters and smooth circular terminals; keep the letters flat and clean, with no gloss, gradient, or outline. Below the title, show exactly five original friends gathered around a picnic blanket, all clearly visible from the waist up or seated, smiling with small simple eyes and waving hands. Give them varied hairstyles, outfits, body shapes, and natural skin tones; use simple geometric shapes and solid fills, with at most one soft darker shadow tone per shape and no heavy contour lines. Place the blanket prominently in the lower middle, angled slightly, with a few simple picnic treats and fruit arranged on it. Arrange the five friends in a loose balanced semicircle around it, their faces and waving hands unobstructed. Use a plain warm cream background with a few soft organic colour blobs behind the group and a handful of small coral, yellow, blue, mint, and pink circles or sparkles. Keep ample clear space around the title and a tidy, sticker-like silhouette for the group. Crisp vector edges, even shadowless lighting, bright and welcoming, charming but not babyish. No extra words, no border, no photorealism, no gradients, no famous characters.